Improved cracker and ghinding-mill



Patented Sept. 1,1869.

imi-

J PARKER Grinding Mill.

IL Pm, FIIOTO L|THOGRAPNER, WAiHINGTON, D. C.

Wesseg 1 Be it known that I, CHARLES PARKER, of Meriden, in the county of New Haven, and State of Oouj taken'in connect-ion with-the accompanying drawings,

' against'a flange upon the edge of the case, to prevent upper, the lower will take its bearing and be held in we am.

HARLES PARKER, or MERIDEN, CONNECTICUT.

Letters Patent N0. 95,131, dated September 21, 1869.

, turnover CRACKER AND GRINDING-Mum;

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

necticut, have invented airImprovement in Box- Mills; and I do hereby declare the following, when and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings c'oustitute part of this specification, and represent, ill- Figure 1-, a frontview; t

Figure 2, a vertical central section;

Figure 3, a top view of the lower runner;

Figure 4, an under view of the upper runner;

Figure 5, a side view of the upper runner; and in Figure 6, a side View of the lower runner.

This invention relates to an improvement in that class of grinding-mills known to the trade as box-mills, and in which two runners are employed, one above the other, the upper acting as a cracker and the lower as the grinder.

Heretofore the lower runner has been made to bear its being raised up so far that the surface of the runner would strike the surface of its case. This creates no incousiderable amount of friction, and makes a constant wear upon the metal, both of which are objections or difiiculties which are fully overcome by my improvements, which consist in constructing the upper end of therlower runner and the lower end of theupper runner, so that while the lower is turned by the position by the upper.

To enable others skilled in the art to construct and use my invention, I will proceed to describe the same, as illustrated in the accompanying drawings;

A is the box, or case, upon the top B of which the upper runner-case O and lower runner-case D are fixed, extending-up. and into the hopper E.

'F, the upper runner, takes'its bearing in the upper end of its case 0, the spindle Gextending up, so that a crank, H, is applied thereto. 7

I is the lower runner, with a pivot, t, restingv in a step on the bridge L1.

The upper end of the lower runner .has a stud, a,

formed thereon, as seen'in figs. 3 and 6, the-said stud having recesses b formed upon opposite sides, and the lower end of the upperrunner F has projections (I, as seen in figs. 4 and 5, corresponding to the recesses in the sides of the stud a, so that when the two are placed together, as in fig. 2, the projections-on the one will set into the recesses of the'other, the upper holding and guid ng the lower.

The stud a takes its bearing upon the under sur-' face of the upper runner, and is of such length, that when the upper runner. is forced against the shoulder, in its case, the surface of the lower runner will just clearthe surface of its case D, which is in a position to grind the finest.

The inill is adjusted by raising or lowering the bridge L, by means of screws N, the bridge' always holding the step of the lower runner central. runners bearing together at their meeting-points, and by their construction held together, there, is no friction in consequence of their united action, and the rubbing or grinding of the metal, as in the construction heretofore, is entirely avoided.

Having fully described my invention, What I claim as new and useful, and desire to secure by Letters Patent, is-

In a box-mill, in which the runners F and'I are set the one above the other, forming the stud a upon one and projections Z d upon the other, so that while the lower is driven by'the turning of the upper, the upper forms the bearing for and holds the lower in itscentral position, substantially as set forth.

- CHAS. PARKER. WVitnesses:

J OHN W. MILES, OHAs. L. TAYLOR.

Thus, the two 

